Nanoscale Research Letters
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2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Tang Jianke,Meng Rongqian,Wang Qi,Zhang Shengjian,Li Qiaoling
The Ag 3 PO 4 /tetrapod-like ZnO whisker (T-ZnOw) heterostructures were prepared via a simple precipitation method. The obtained heterostructures were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The photodegradation activity of Ag 3 PO 4 /T-ZnOw was evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation. When the molar ratio of Ag 3 PO 4 to T-ZnOw was 10% (Ag 3 PO 4 /T-ZnOw-2), the highest degradation efficiency (92.9%) could be achieved among the heterostructures. The photodegradation rate constant of Ag 3 PO 4 /T-ZnOw-2 (0.05179 min −1 ) was 3.59 times that of T-ZnOw (0.01444 min −1 ). Besides, the Ag 3 PO 4 /T-ZnOw-2 photocatalyst still possessed a degradation efficiency of 77.8% after four successive cycles. The Ag 3 PO 4 /T-ZnOw-2 catalyst had much higher photocatalytic activity than pure T-ZnOw and better stability and reusability than pure Ag 3 PO 4 . The effect of different scavengers on degradation efficiency was investigated, and the possible photocatalytic mechanism of the Ag 3 PO 4 /T-ZnOw photocatalyst was also put forward.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 3
·882-890
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IF 2.372
Zhang Lu,Yu Deyou,Wu Minghua,Lin Junxiong
Abstract In order to improve the photocatalytic degradation performance of Ag 3 PO 4 and reduce the cost of photocatalyst made of Ag 3 PO 4 , a kind of Ag 3 PO 4 /TiO 2 composite was successfully fabricated via a simply precipitation method for the Ag 3 PO 4 nanoparticles being loaded on the surface of commercial titanium dioxide (P25) to form a heterostructure. The Ag 3 PO 4 /TiO 2 composite were characterized by FT-IR, XRD, XPS, FE-SEM, HR-TEM, DRS and PL and applied for the degradation of formaldehyde solution under solar radiation. The results showed that the degradation rat of Ag 3 PO 4 /TiO 2 composite (0.01796 min −1 ) was much higher than that of pure Ag 3 PO 4 (0.00775 min −1 ), indicating that the Ag 3 PO 4 /TiO 2 composite possessed better photocatalytic degradation activity for the formaldehyde solution than pure Ag 3 PO 4 . The composite significantly decreased the dosage of silver for photocatalyst under solar radiation, thereby reduced the cost of the photocatalyst made from silver. Graphical Abstract
研究领域:
环境科学
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材料科学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2016
·Vol. 23
·期 14
·14422-14430
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IF 2.76
Yan QiShe,Xu MengMeng,Lin CuiPing,Hu JiFei,Liu YongGang,Zhang RuiQin
A facile, environmental-friendly Ag 3 PO 4 -PN photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of ammonia and polyvinyl pyrrolidone (PVP). As-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy (UV–vis DRS). The enhancement of photocatalytic efficiency of Ag 3 PO 4 -PN is strongly dependent on the excellent photo-absorption capacity, sharp edges and corners, and synergistic effect of PVP and NH 3 ·H 2 O. The effects of catalyst dosage, TC concentration and solution pH were explored with tetracycline hydrochloride (TC) as target contamination. The mineralization was evaluated by total organic carbon (TOC) analysis and determination of the concentration of inorganic ions such as NO 3
− and Cl − . Radical detection experiment indicated the h + and ·O 2− are major active species in the degradation of TC by Ag 3 PO 4 -PN. Moreover, photocatalyst stability and regeneration experiments exhibited the favorable stability and rejuvenation ability, suggesting a promising prospect of practical application of Ag 3 PO 4 in the wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Lei Lei,Deyu Wang,Yongfu Kang,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
The combination of a phosphor with semiconductor photocatalysts can provide photoactivity in the dark. Indeed, the phosphor acts as a “light battery”, harvesting photons during irradiation and later re-emitting light that can be used by the catalytic phase when in conditions of total darkness. This allows for continued activity of the composite catalyst, even in conditions of unstable light stimulation. In this study, we assess the use of a heterojunction, namely graphitic-C3N4/Ag3PO4, that enables efficient photoactivity specifically under visible light stimulation, in combination with a phosphor that exhibits green–blue phosphorescence (510 nm), that is SrAl2O4:Eu2+,Dy3+. Our findings showed that this combination was particularly interesting, noticeably displaying significant photoactivity in darkness, after short periods of activation by visible light. After finding the right combination and optimal ratios for maximum efficiency, the resulting catalyst composite was immobilized on resin supports with a fractal surface, printed by LCD-SLA 3D printing. The immobilization was effectuated via an aqueous-phase plasma-aided grafting (APPAG) process, using cold plasma discharge (CPD) and using vinylphosphonic acid (VPA) as a coupling agent. Whereas the colloidal photocatalyst displayed a serious problem of partial physical separation between the catalytic phase, g-C3N4/Ag3PO4, and the phosphor, the immobilization of the composite catalyst on polymer supports allowed solving this issue. Photodegradation assessments confirmed that the hybrid supported phosphor-enhanced catalyst was active, notably in dark conditions, as well as fairly photostable. This study offers new prospects for the fabrication of polymer-based panels for water purification, with round-the-clock activity and that are, in addition, extremely easy to recover and reuse, by comparison with colloidal catalysts.
研究领域:
材料科学
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环境科学
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化学工程
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PubMed
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 151
·期 3
·734-747
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IF 2.482
Zhang Xiaorui,Chen Chen,Jiang Caiyun,Zhou Haifei,Cao Wang,Wang Yuping
Abstract A new type of Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction nanocomposite with visible light catalytic activity was successfully prepared. The synthesis of the composite was confirmed by XRD, FT-IR, SEM, TEM, EDS, XPS. The Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction can effectively improve the utilization of visible light. The optimal Ag/U/1/4 composite has the highest degradation efficiency for methylene blue (MB, 30 mg/L) in 90 min (80%) and Norfloxacin (NOR, 10 mg/L) in 150 min (85%). The decrease of Nyquist radius and the enhancement of photocurrent response indicated that the combination of photogenerated electron–hole pair in Ag 3 PO 4 /UiO-66-NH 2 composite material is significantly inhibited. N 2 adsorption–desorption and zeta potential results indicated that biggish specific surface area and negative zeta potential value are more favorable for the adsorption of the cationic dye MB. The cyclic test verified the good stability of Ag 3 PO 4 /UiO-66-NH 2 heterojunction material. Furthermore, the photocatalytic degradation mechanism of MB was discussed by introducing different traps to inhibit the possible active substances in the degradation process. This work testified that an efficient photocatalytic composite based on metal–organic frameworks can be used for the degradation of pollutants. Graphic Abstract
研究领域:
材料科学
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环境科学
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光催化
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Caiyu Luo,Yan Lin,Yupei Zhang,Shuai Zhang,Shehua Tong,Shaohua Wu,Chunping Yang
Antibiotics in swine wastewater could lead to risks to the environment and human health, and it is a competitive alternative to degrade antibiotics via photocatalysis which is green and eco-friendly. However, charge separation efficiency and light absorption capacity have been key factors limiting the technology. In this work, we synthesized the novel photocatalysts of MOF-545/Ag 3 PO 4 via solvothermal methods, and examine the performance and mechanism for the degradation of oxytetracycline (OTC) in swine wastewater. The results showed that compared with Ag 3 PO 4 , the composite catalysts have stronger photoresponse and charge separation ability. MOF-545/Ag 3 PO 4 could completely degrade OTC within 3.0 min with a rate constant of 3.97 min −1 which is 12.9 times that of Ag 3 PO 4 . OTC removal was still 100% within 3.0 min after 5 cycles, which confirmed that the composite catalyst was stable. Data from free radical capture tests showed that photogenerated holes (h + ) and superoxide radicals (•O 2 – ) played a dominant role in OTC degradation. In-situ X-ray photoelectron spectroscopy (XPS) spectra and electron spin resonance (ESR) spectra proved the formation of an S-scheme heterojunction in MOF-545/Ag 3 PO 4 , which greatly improves the carrier separation efficiency of catalysts. This study provides a novel MOF-based catalyst for improving photocatalytic performance.
研究领域:
环境科学
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材料科学
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高影响因子
Journal of Environmental Chemical Engineering
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2017
·
IF 0
Jun Liu,Qingyong Tian,Zhaohui Wu,Weijing Yao,Xiangheng Xiao,Wei Wu
Trinary g-C 3 N 4 /Ag/Ag 3 PO 4 heterostructures with different Ag content were designed and synthesized by in situ deposition and reduction routes. The photocatalytic performances of these heterostructures were investigated under visible light (λ > 450 nm) and simulated sunlight. Moreover, the influence of Ag content and ratio of each component on the photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 was also studied. As a result, the photocatalytic activities of all these g-C 3 N 4 /Ag/Ag 3 PO 4 samples were higher than commercial P25 (TiO 2 ). Moreover, sample S1 (the ratio of g-C 3 N 4 , Ag 3 PO 4 and Ag is 1: 2.52: 0.12) showed the better photocatalytic activities than other g-C 3 N 4 /Ag/Ag 3 PO 4 samples (S2 and S3) and g-C 3 N 4 /Ag 3 PO 4 (1: 3) under the same light irradiation. It indicated that small amount of Ag nanoparticles could improve the photocatalytic performances by compared with g-C 3 N 4 /Ag 3 PO 4 sample. And S1 showed a stable photodegradation after 6 times of cycle experiments under simulated sunlight. The stable and significant superior photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 could be attributed to the fast charge separation among g-C 3 N 4 , Ag and Ag 3 PO 4 during the Z -scheme charge transfer and recombination process.
研究领域:
材料科学
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环境科学
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DOI
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Silong Wang,Yan Wang,Jinquan Wan,Yongwen Ma,Zhicheng Yan,Guihua Zhang
With high redox ability of electrons and holes, Z-scheme heterojunction is a promising composite structure in the photocatalysis. However, it is challenging to inhibit the recombination of carriers by Z-scheme transfer. Herein, a novel Ag 3 PO 4 /AgBr/Ti 3 C 2 Tx hybrid with dual channel carrier transfer structure was fabricated. Ti 3 C 2 Tx not only serves as a template for growth of Z-scheme Ag 3 PO 4 /AgBr, but also can be used to accommodate holes transferred from Ag 3 PO 4 and AgBr. The first channel is consisted of Z-scheme transfer of carriers in Ag 3 PO 4 /AgBr. And the hole transfer from the AgBr valence band to Ti 3 C 2 Tx constitutes the second channel, which avoids directly carrier recombination in AgBr valence band. Dual channel carrier transfer pathway was proved by in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS). After Ti 3 C 2 Tx was introduced, the quantum efficiency of Ag 3 PO 4 /AgBr increased from 10.59% to 12.50% with reducing Cr(VI), indicating an increase in carrier utilization. The improvement of the degradation efficiency of rhodamine B from 80.77% to 94.72% is benefited from the enhanced quantum efficiency. The dual channel carrier transfer heterojunctions design provides a new idea for constructing an efficient composite photocatalytic structure.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhouyue Wu,Jinpeng Yu,Wenfang Wang,Changhui Xin,Xin Yu,Yanting Tang
Antibiotics contaminants gradually evolve into one of widely concerned public safety events and attract numerous investigations. In this work, hybrid AgI@Ag 3 PO 4 nanostructures were designed and synthesized for visible-light photodegradation of norfloxacin via facile self-assembly formation strategy method. The well mixed anions here induced good interface contacts and the formation of AgI@Ag 3 PO 4 nanostructures. The experimental results indicated that nanostructured AgI@Ag 3 PO 4 composites showed highly enhanced visible-light photocatalytic performance, and the AgI@Ag 3 PO 4 -15 sample presented the best visible-light photocatalytic performance, which was far better than that of pristine AgI and 2.96 times of pristine Ag 3 PO 4 . These findings were mainly attributed to construction of heterostructure structures between AgI and Ag 3 PO 4 as well as the surface plasmon resonance effects of the generated Ag nanoparticles. Besides, the main active species, possible visible-light photodegradation pathways, and visible-light photocatalytic mechanism were also proposed in detail. Current work indicates an efficient and promising visible-light composite photocatalyst for emerging pollutants degradation.
研究领域:
环境科学
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材料科学
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光催化技术
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高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 5
·2934
·
IF 4.614
Hong Liu,Houwang Chen,Ning Ding
In this research, the preparation of a Ag3PO4/g-C3N4@MoS2photocatalyst and the performance and mechanism of degradation of 2-amino-4-acetaminoanisole (AMA) were studied. The phase composition and morphology of the synthesized samples were comprehensively characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet–visible diffuse reflectance (UV–Vis), and photoelectron spectroscopy (XPS). The catalytic performance of the photocatalyst was evaluated by the visible-light catalytic degradation of the AMA. The experimental results show that the Ag3PO4/g-C3N4@MoS2composite photocatalyst has stronger photocatalytic oxidation and reduction capabilities than Ag3PO4and Ag3PO4/g-C3N4. The material only decreases by 31.3% after five cycles of use, indicating that the material has good light stability. Free radical capture experiments prove that photo-generated holes (h+) and superoxide radicals (·O2−) are the main active substances in the photocatalytic process. The fundamental studies in the present research provide a new perspective for constructing an innovative type of visible-light photocatalyst and a new way to promote the photocatalytic degradation of organic pollutants.Keywords:catalysis;degradation;nanomaterials;Ag3PO4;heterojunction formation
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Yi Duan,Lin Deng,Zhou Shi,Lei Zhu,Guangchao Li
A highly efficient visible-light-driven photocatalyst Ag 3 PO 4 /AgI-Graphene (Ag 3 PO 4 /AgI-G) was synthesized through a chemical coprecipitation procedure. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were performed to study the physicochemical structural of the photocatalysts. The photocatalytic activity of the samples was examined by the carbamazepine (CBZ) degradation under artificial visible light and natural sunlight irradiation. Experimental results indicated that the introduction of low mass content of graphene enhanced the photocatalytic performance of Ag 3 PO 4 /AgI, and the photocatalytic degradation efficiency of CBZ over Ag 3 PO 4 /AgI-3%G (mass ratio of graphene:Ag 3 PO 4 /AgI = 3:100) reached 93.06% within 21 min, which was much higher than that over pure Ag 3 PO 4 (26.92%) and Ag 3 PO 4 /AgI (74.38%). UV–vis diffuse reflectance spectra, photoluminescence (PL) spectra, transient photocurrent responses and electrochemical impedance spectra (EIS) of the samples were conducted to verify the high photocatalytic performance of the Ag 3 PO 4 /AgI-3%G. In addition, possible photocatalytic degradation pathways of CBZ were proposed based on the analysis of transformation products during the reaction. The reactive species trapping experiments and Electron spin resonance (ESR) analysis demonstrated that h + and O 2 − were the main active oxidant species responsible for CBZ photodegradation. The photocatalytic degradation mechanism of CBZ over Ag 3 PO 4 /AgI-3%G under visible light irradiation was schematically proposed. This study not only provides a new technique for the synthesis of Ag 3 PO 4 -based photocatalysts with high photocatalytic activity, but also demonstrates that the Ag 3 PO 4 /AgI-3%G composite could be a promising photocatalyst for the treatment of waters containing CBZ.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 15
·1-16
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IF 2.8
Ding Huihui,Shi Huimin,Wang Tao,Zhang Hengyang,Li Shuang,Zhang Xinshui
In the photocatalytic process, mixed-phase TiO 2 tends to have more carrier transport channels compared with single-phase TiO 2 , which can further accelerate the separation of photogenerated carriers. In this study, biphasic TiO 2 nanofibers containing both rutile and anatase phases were synthesized by electrostatic spinning technique. Subsequently, a variety of biphasic TiO 2 /Ag 3 PO 4 nanofiber photocatalytic materials with different ratios were prepared by combining the in situ growth process. The test results confirm that not only heterojunctions are formed between the components of the composites, but also the optical properties are improved. When the content of Ag 3 PO 4 was 25 wt%, the composite showed excellent photocatalytic activity for both rhodamine B (RHB) and methyl orange (MO). In addition, the main active substances and stability of the composite were investigated by doing active agent capture experiments and stability tests, and a reasonable photocatalytic mechanism was proposed on the basis of the relevant test results.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
危险品化学品经营许可证（带存储）